Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b275da0e21f0120…

MALICIOUS

PDF

55.4 KB Created: 2020-08-24 12:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07830a753be6b2c12dc277094bb51aed SHA-1: 56e3edb52989bdc83ced6af0cdb9645c9be02886 SHA-256: 0b275da0e21f0120537904fe43c27d07532bb7c6be3eec66bffb807eaa5b255a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded links, many pointing to external PDF files, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.ru', which is used to obscure the final destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=app+even++minecraft
    • http://dijokix.nhvfd18.org/uploads/1/3/0/7/130739595/pewukewuxenamuv_tiwad_tuwudoguzolol_mopab.pdf
    • http://files.hillcresteastpoint.org/uploads/1/3/2/7/132712080/5313812.pdf
    • http://files.hwcroquetclub.com/uploads/1/3/1/4/131453588/pukon_budejopafo_xodozogudu.pdf
    • http://files.ponderingcat.com/uploads/1/3/1/3/131384429/4dfa0ac6ee05.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1921/4756/files/uidai_aadhar_password.pdf
    • https://cdn.shopify.com/s/files/1/0432/7328/9894/files/breville_bread_maker_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2373/6725/files/ludivovuxupixupegofo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1180/0220/files/soursop_health_benefits.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/60613533822.pdf
    • https://cdn.shopify.com/s/files/1/0433/0677/8777/files/jerekana.pdf
    • https://cdn.shopify.com/s/files/1/0446/0973/2771/files/functional_data_analysis_ramsay_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/3728/6812/files/honeywell_pro_5000_installation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0443/2723/9836/files/proform_cardio_hiit_trainer_reviews.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/43860924818.pdf
    • https://cdn.shopify.com/s/files/1/0429/9263/1962/files/galaxy_a50_specs.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5923/files/vezaputijimanukek.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/70475301118.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009bf6.bin
8397c090932b911f53e9b1fcfeb5382e247f2c6af73569aac46c5c10a1e3f972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF6 5000 bytes
font_01_sfnt_off0000ace1.bin
18934811e763cdc246f7126fe0b00fc37c7160ccb4f1a7b8a8b43e332cbcebc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACE1 10332 bytes

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